Portable navigation device



FIG. 1 is a perspective view showing the front and upper surface of the device.

FIG. 2 is a front view of the device.

FIG. 3 is a rear view of the device.

FIG. 4 is a bottom view of the device.

FIG. 5 is a top view of the device; and,

FIGS. 6 and 7 are opposing side views of the device. 

CLAIM The ornamental design for a portable navigation device, as shown and described. 